There are two versions of the Internet Protocol (IP): IP version 4 and IP version 6. Each version defines an IP address differently. Because of its prevalence, the generic term IP address typically still refers to the addresses defined by IPv4. The gap in version sequence between IPv4 and IPv6 resulted from the assignment of number 5 to the experimental Internet Stream Protocol in 1979, which was never referred to as IPv5.
Reverse IP lookup and reverse DNS tools give you the ability to receive a list of domains hosted on a particular IP address or DNS entry. This is very helpful for those wishing to confirm shared or dedicated hosting from their web hosting providers. In computer networking, reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet. To check how many websites are hosting on a particular IP address, use our Reverse IP lookup.